Pattern-drawing machine



ASW. C. NORCROSS. PATTERN DRAWING MACHINE. APPLICATION man mns-12, 1920.

' Patented May17, 1921.

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f for w. c. NomzRossl PATTERN DRAWING MACHINElA I APPLICATION FILED vJUNE 1.2, 1920.

1-,; ,"78v,186, Patented Mayu, 1921.

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W. C. NORCROSS. "PATTERN DRAWING MAcmNE. MIPLICATION FILED JUNE 12, 192g.

Patented May 17, 1921.

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UNITED s'IAIss R'AIIIIJ'I oFFlcE.

WILLIAM C. NORCRSS, 0F TERRE HAU MOLDING- MACHINE COMPANY, OF TION OF I NDIAII'A.V Y

In, INDIANA, AssIGNoII ro AMERICAN 'Inman IIAII'III, INDIANA; A conronA- PATTERN-DRAWING MACHINE.

To all whom it may concern.'

Be it known that AI, WILLIAM C. Noncnoss, a citizen of the United States', residing at Terre Haute,y in the county of VigoV and State of Indiana, have invented certain new and useful Improvements in Pattern-Drawing Machines, of which the following is a specification. v l c This invention relates to pattern drawing machines and is an improvement on the Inachine set forth in my application filed April 24, 1920, Serial No. 376,287. i

This invention, like the machine of my aforesaid application, has for its objects, first, to apply the lifting means at a considerable distance from the center-of the pattern board, thus linsuring a steadying action; second, to provide means for clamping the drawing head or frame to the pattern board at either the sides or ends thereof; third, to provide for maintaining parallelism of the drawing frame in relation to the pattern board; fourth, to make provision for an improved mounting or application of the machine to the flask whereby it is supported on the flask and special connections are obviated; fifth, to provide for adjustments to adapt the machine to any size of liask coming within its range.

In addition to the foregoing obj ects which are accomplished bythe present improved machine, my present invention has for its object the provision of a simple cable and sheave arrangement combined in a knovel mannerY with the drawing frame or head and the support-ing frame to which any suitable lifting means or hoist, such as used in foundries, may be applied for the purposes, first, of suspending the pattern drawing machine and locating it on the flaskand, second, for drawing the pattern.

While my invention carries out the general objects which I have enumerated, it differs mainly from the machine of my application Serial No. 37 6,287 Ain the provision of the cable and sheave suspending and operating means which renders unnecessary the employment of a drawing cylinder and pistonand the use of compressed air for purposes of operation. In brief, with the present improvements, any lifting means or hoist used in a foundry may be utilized to position the present machine, draw the pattern and remove themachme from the flask.

frame 6, are slidable speeieatien ef Letters raient. Patented May 17,1921, Application mea :rune 12', Iaao. serial No. 388,531. f

The disclosure in the accompanying drawings, and which is hereinafter described, represents a practical embodiment of my Invention, sorted to without departing from the essential principle-thereof, such disclosure and description may be considered as illustrative, instead of restrictive, of the invention.

In the accompanying drawin s,

Figure 1is a side elevation;`

modification,and Fig. 4 is a plan viewV of the machine of Figs. 1 and 2.

The upper part of the flask from the pattern is to be drawn, appears at 1; the sand is shown-at 2 and the pattern is represented at 3, said pattern beingattached to the usual pattern board 4 which rests upon flask 1. he flask is shown in `inverted position, after it has been rammed, either on a machine or byv hand. Having been rammed, the flask is picked up by hand` or `power means and vturned over or set down wherever for the applicationL thereto of the present drawing machine. l V

My drawing machine has an upper frame 5 anda lower frame 6, The vupper frame 5 Y ig. v2 is an.- end elevation; Fig. :3 ,is a diagram of av but, as modifications may be 'ref4 desired, sov that it will be adapted l :zol

has lugs 7 providedfwith horizontalbores.

to bore holes 9 to be passed through said holes and made to reston the flask. 1,

to enable my machine to be applied to a flask.

There are bores 12 in each cross head which are slidably.

mounted on the projecting ends of'shafts 8,v thus enabling the posts 9 to be lmoved laterally to any position required to Vsuit the position ofthe holes 11 board of the particular flask which is to be drawn. Set screws 13 secure'the cross heads 10 to the shafts 8.

in the ypattern Vertical guide posts 14 whose lower ends i in sockets `15 onzlo-wer through vertical'iguides .16 on upper frame 5. The guide. postsj14 keep the drawing frame 6 parallel to the joint of the flask, .thereby insuring accurate drawing of the pattern, The lower face of are securely seated the frame 6 is machined to fit against the battens of the .bcard.4.- Stirrups 17 which are secured at 18 `to`-l the sides or ends of the board`4, are adaptedVv to be engaged by -U- clamps 19 which, in turn, overhang an outstanding marginal flange 20 on frame 6 and are secured by wedges 21. By these, or other V through which pins Vmaybe inserted to rest on the guides 1'6'for the purpose of holding thefra'me 6 in raised position, if desired.

Mounted'on' the frame 6 in the median plane ory longitudinal axis thereof are sheavesv24. A cable 25,` which'has its ends secured to the ends of the frame 5 in the median plane yor longitudinal axis thereof, runs around the sheaves 24 and over a loose sheave26 which hasa clevis 27. The cable 25 straddles a tie bar 28 on the frame 5, the sheave26 being located above said tie bar. The tie barApre'vents ysheave 26 and cable 25 from dropping when not in use.

Having set the posts 9 nearer or farther apart according'to the size of the flask which is to be drawn, the set screws 13 are tight- 'ened ,toV clamp theposts 9 to the shafts 8.

Any suitable vlifting means or hoist may be applied to'v the clevis 27,'therebyr drawing u on the frame 6 until it is against frame 5; Tllie machine I'riaynow be lifted and placed 0n the flask Vfrom which the pattern is tobe drawn. The posts 9 having been entered in the holes 11 and made to rest upon the flask 1, the hoist is loweredv until the frame 6 rests upon the battens of the pattern board 4.l The clamps 19 vare now applied to the stirrupsfand the wedges 21 driven home, thereby firmly clamping the frame 6 to the ,Y pattern-board4. VThe hoist or lifting means is againapplied to the clevis 27 and the clevisand sheave`26 raised.- The upward pulling of the central part of the cable 25 draws the @frame 6 upwardly, the guide posts 14 sliding throughthe guides 16. The endsof'the cable 25 being fastened to the upper-frame 5',- the'lifting action causes the posts 9, to be pressed down upon the flask 1, thus firmly holding the machine in position while the pattern' is being drawn. Corr tinued elevation of the frame 6 up to or against theframe 5 'finally draws the pattern .from the flask'. lWhen the frame 6 ena'ges' frame 5, the entire machine is lifted ro'm the flaskfand may be swung clear thereof. The pattern boardv and pattern are then released by knocking out the wedges 21 and removing the clamps 19.

to bore the holes 11 in the pattern vboard 4 4 so that the lower end's'yof the postsr` 9 may be allowed to pas'sthrough andrest on the yflask ,1. By this arrangement and the use vof the clamps, the pattern board is lifted at a considerable distance fromits; center, insuring an even draw. The adjustability offth'e `posts 9-'enables a single machine, within its range, to be made quickly applicable to any sizeof flask.'v

The use of the cable and-sheavesu'spend ing and *operating means enables the ma# chine to be made invery simple,"durable` and light form and does away entirely with an expensive piston and ,cylinder-and the' use of compressed air, or` other 'external' means, beside enabling ordinary hoist orV liftingdevices'rcommonly employedinfa foundry to be used in operatingthe machine. f

VAs shown-in Fig. 3, in'lieu of the sheave 26 there may be employed an equalizing bar 26ato whose ends the endsfof the -cables 25fL are'connected; the'clevis 27a being connected tothe central partV of thev -bar 26a.'

What I claim"-is:- 1. In a pattern drawingmachine, the combination with'a Vsl'ipporting frame'and upright posts fo'r'sustaining said' frame, o f a slidably mounted pattern drawing frame movable up and down in relation to said supporting frame, and cable'and sheave rais.-v ing and lowering means forfsaid' slidably mountedpattern drawing fr-mieA Y 2. In 'a pattern drawingniachine, the combination with'a supporting fr 'ame,t"of a slidably mountedl pattern drawing" frame, and cable and sheaveraisingf'and lowering means for said pattern drawing frame com.;-

prising an anchored cable, sheaves on the A and to the suspending andoperating device.

V4. Ina pattern drawing machine', ythe combination with an upper 'frame`,'o"f supporting posts therefor adapted Yto 'rest on't'he flask from which a pattern is to'be drawn, a slidably mounted frame 'adapted for-1 connection to thel pattern board of theflask, and cable and sheave raising and'lowering means for said slidably mounted fram' 5. In a pattern' drawing machine, the

combination with an upper frame, of supsupporting, frame, sheaves carried by the porting posts therefor adapted to rest on slidably mounted frame, a cable suspending the flask from which a pattern is to be and operating device, andra cable Whose n- 10 drawn, a slidably mounted frame adapted termediate portion runs over the said 5 for connection to the pattern board of the sheaves and Whose ends are anchored.

flask, means for guiding the slidably In testimony WhereofI aiix my signature. mounted frame in relation to the upper, WILLIAM C. NORCROSS. 

